JPH0942441A - Engine overrun preventive system of manual transmission for car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an engine to be driven at the maximum allowable engine speed through a skip mannual transmission covering from the high to low speed step by providing restricting means for restricting selecting means in response to the speed of vehicle and enabling only shifting means to be operated. SOLUTION: When a vehicle runs at high speed under the condition where a shift lever 2 is positioned at 5 speed step, a present vehicle running speed is transmitted to an ECU from a vehicle speed sensor 28, and the controller compares the value with the reference value set in a ROM. If it is over the reference value, a control signal is output to an actuator 26. Then, a second selector member 14 is pulled, and while the member 14 turns in the direction shown by the arrow N1 around a selector, shaft operation of selector is made at high speed in the case of mannual shifting. The lever 2 can perform only the shifting operation from 5 to 4 speed step, and the selector operation is not carried out, whereby no skip mannual operation from 5 to 2 speed step is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine overrun prevention system for a manual transmission for a vehicle, and more specifically, a manual skip shift from a high speed stage to a low speed stage is performed by a driver's mistake to perform a skip manual shift. The present invention relates to a system for preventing an engine overrun that may occur due to an accident.

[0002]

2. Description of the Related Art In a vehicle equipped with a manual transmission, a driver moves a gear shift lever provided in a driver's seat to a high speed stage or a low speed stage according to a running state of the vehicle, and a driving force of an engine is It is configured to be transmitted to the wheels.

In such a manually-shifted vehicle, the driver moves the shift lever according to the number of revolutions of the engine and the traveling speed of the vehicle. Therefore, unless proper shift timing is performed, the amount of fuel consumption is reduced. As the engine noise increases, the engine noise increases and the content of harmful substances in the exhaust gas increases.

[0004]

For example, in the case of an engine having a high idle of 2500 RPM, it is assumed that the engine is running at the 5th speed in a state of 1500 RPM or more. At this time, when the shift lever has to be moved to the position of the fourth speed according to the traveling condition, if the driver shifts the shift lever to the position of the second speed, so-called skip manual shift is performed, Reverse driving torque is transmitted from the wheel side to the engine side, and the engine speed increases more than before the gear shift. As a result, the engine becomes overrun. In particular, a diesel engine may be deeply damaged when it is driven at a speed higher than the maximum allowable speed.

However, the conventional manually-shifted vehicle has no means for preventing the skip manual shift from the high-speed stage to the low-speed stage, so that the above-mentioned problems may occur. This phenomenon is more likely to occur in a vehicle having a long mileage, as the joint portion of the speed change mechanism is worn and the flow of the speed change lever is deeper.

The present invention has been devised in order to solve the above-mentioned conventional problems, and an object of the present invention is to make an engine exceed a maximum allowable rotational speed by skip manual shifting from a high speed stage to a low speed stage. An object of the present invention is to provide an engine overrun prevention system for a vehicle manual transmission that can prevent the vehicle from being driven.

[0007]

SUMMARY OF THE INVENTION An engine overrun prevention system for a vehicle manual transmission according to the present invention is a gear shift for performing a selecting operation for selecting a desired gear and a shifting operation for shifting to the gear. A lever, a selecting means driven by a selecting operation of the speed change lever, a shifting means driven by a shifting operation of the speed change lever, and the selecting means are restrained according to a vehicle speed, and a shifting means. And a restraining means that makes it operable only.

The selecting means has a selector shaft which rotates in response to a selecting operation of the speed change lever, a first selector member which rotates with rotation of the selector shaft, and a predetermined portion with respect to the first selector member. A second selector member that is independently rotatably provided in the rotation direction of the selector shaft and that transmits the selecting operation of the shift lever to the transmission.

The restraint means restrains the second selector member at a predetermined position so that the selecting operation of the shift lever is not transmitted from the second selector member to the transmission.

The restraint means compares an actuator for moving the second selector member to a predetermined restraint position, a vehicle speed sensor, and a signal input from the vehicle speed sensor with preset data to compare the input signal. And an electronic control unit that outputs an operation signal to the actuator so as to move the second selector member to a predetermined restraint position when the value is larger than the predetermined data.

The first selector member and the second selector member are connected by an elastic body, and when the restraint of the second selector member is released by the restraint means, the second selector member is moved to the first selector member. It is possible to return to a predetermined position with respect to the selector member.

The selector shaft is rotatably held by a sleeve fixed to the vehicle body.

The first selector member is provided with a stopper that engages with the second selector member only in a predetermined rotation direction.

[0014]

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows an engine overrun prevention system for a vehicle manual transmission according to the present invention, FIG. 2 shows a state in which this system is mounted on a transmission, and 2 is provided in a driver's seat. Refers to a normal gear shift lever.

The shift lever 2 is provided with a selector rod 4 and a shift rod 6, respectively, so that the select and shift actuating forces can be transmitted to the transmission side by the movement of the shift lever. The present invention provides means for restraining the select operating force in the select and shift operating forces so as to prevent the driver from selecting another shift speed gear by mistake.

The above-mentioned means can be provided between the selector rod 4 and the selector lever 8 that is rotatably provided outside the transmission and transmits the operating force to the cross shaft (not shown). The select operation force restraining means provided by the present embodiment is a selector shaft 10 which is rotatable in both directions (forward and reverse directions) by the select operation force, and is fixed to one side end of the selector shaft 10 together. It includes a first selector member 12 that rotates, and a second selector member 14 that is rotatably disposed between the first selector member 12 and the selector shaft 10.

The first selector member 12 is provided with a stopper 16 that allows the selector shaft 10 to rotate together with the second selector member 14 when the selector shaft 10 operates as a selector. In between, the first and second selector members rotate together when normal selector operation is performed, and the second selector member 1 when the system according to the present embodiment operates.
A coil spring 18 is provided which allows only 4 to rotate.

A sleeve 19 into which the selector shaft 10 can be inserted is provided on the second selector member 14 so that the second selector member 14 can smoothly rotate around the selector shaft 10.

The coil spring 18 has one end fixed to the first selector member 12 and the other end fixed to the second selector member 14.

Although the selector shaft 10 is shown in a cut state in FIG. 3, it is substantially fixed to the first selector member 12 by a connecting means such as a bolt. The selector shaft 10 includes a bracket 20 fixed to a vehicle body (not shown) and the bracket 2
It is provided in a fixed position by a sleeve 22 fixed to zero. In the present embodiment, the selector shaft 10 is inserted through the sleeve 22, and a bracket 24 is provided at one end of the selector shaft 10 to be connected to the selector rod 4.

An operating rod of an actuator 26 is connected to the second selector member 14 so that the second selector member 14 can be pulled in a predetermined state. The predetermined state means a state in which the object of the present invention can be realized, that is, when the manual shift is performed from the high speed stage to the low speed stage, the selector movement is restrained so that the skip manual shift is not performed. Means

In order to achieve such an object, the actuator 26 provided in this embodiment is an electronic control unit EC.
A vehicle speed sensor 28 is connected to an output end of U and an input end of the electronic control unit ECU. For this actuator 26, for example, a solenoid valve can be used.

At the free end of the second selector member 14,
Another selector rod 30 connected to the selector lever 8 that directly transmits the select actuating force of the selector rod 4 to the transmission is connected.

The engine overrun prevention system for a vehicle manual transmission according to the present invention having the above-described structure allows the vehicle speed sensor 28 to detect when the vehicle travels at high speed with the speed change lever 2 positioned at the fifth gear. Electronic control unit EC
The current vehicle traveling speed is transmitted to U. When the current vehicle traveling speed is input to the electronic control unit ECU, the controller of the electronic control unit ECU compares it with the reference value set in the ROM, and outputs a control signal to the actuator 26 if the reference value is exceeded. Come to do.

With this control signal, the actuator 26
Since the second selector member 14 is pulled, the second selector member restrains the selector operation during manual shift while rotating around the selector shaft 10 in the direction of arrow N1 in FIG. Due to the above-described action, as shown in FIG. 4, the speed change lever 2 is in a state in which it cannot move in the arrow A and arrow B directions.

Therefore, the shift lever 2 can only perform the shifting operation from the 5th speed to the 4th speed, and the selection operation cannot be performed. Therefore, the skip manual shift is performed from the 5th speed to the 2nd speed. You will not be missed.

When the vehicle speed is equal to or lower than the set value, the electronic control unit ECU cuts off the control signal transmitted to the actuator 26, and the actuator 26 makes the second signal.
Allow the selector member 14 to be free from restraint. In this state, since the shift lever 2 can be selected and shifted to another low speed stage, a general shift operation can be performed.

[0029]

As described above, according to the engine overrun prevention system for a vehicle manual transmission of the present invention,
By preventing the skip manual shift from the high gear to the low gear due to the driver's mistake, it is possible to prevent the engine from being driven at the maximum allowable speed or more.

[Brief description of drawings]

FIG. 1 is an engine overrun prevention system according to the present invention.

FIG. 2 is a view showing an installed state of the engine overrun prevention system according to the present invention.

FIG. 3 is an exploded perspective view of essential parts of an engine overrun prevention system according to the present invention.

FIG. 4 is a diagram for explaining a shift lever movement range of a vehicle in which an engine overrun prevention system according to the present invention can be provided.

[Explanation of symbols]

 2 gear shift lever 4 selector rod 6 shift rod 8 selector lever 10 selector shaft 12 first selector member 14 second selector member 16 stopper 18 coil spring 20 bracket 22 sleeve 24 bracket 26 actuator 28 vehicle speed sensor 30 selector rod ECU electronic control unit

Claims (7)

[Claims] 1. A shift lever for performing a selecting operation for selecting a desired shift speed and a shifting operation for shifting to the shift speed; a selecting means driven by the selecting operation of the shift lever; An engine overrun prevention system for a manual transmission for a vehicle having a shifting means driven by a shifting operation of a shift lever and a restraining means for restraining the selecting means according to a vehicle speed and enabling only the shifting means to operate. . 2. A selector shaft that rotates in response to a selecting operation of the shift lever, a first selector member that rotates with the rotation of the selector shaft, and a selector shaft that rotates relative to the first selector member. 2. A vehicle manual according to claim 1, further comprising: a second selector member that is independently rotatably provided only in a predetermined rotation direction on the selector shaft, and that transmits a selecting operation of the speed change lever to a transmission. Transmission engine overrun prevention system. 3. The vehicle according to claim 2, wherein the restraint means restrains the second selector member at a predetermined position so that the selecting operation of the shift lever is not transmitted from the second selector member to the transmission. Engine overrun prevention system for manual transmissions. 4. The restraint means compares an actuator for moving the second selector member to a predetermined restraint position, a vehicle speed sensor, and a signal inputted from the vehicle speed sensor with preset data, and inputs the input. 4. An electronic control unit that outputs an operation signal to the actuator so as to move the second selector member to a predetermined restraint position when the value of the signal is larger than the predetermined data. An engine overrun prevention system for a vehicle manual transmission as described in (1). 5. The first selector member and the second selector member are connected by an elastic body, and when the restraint of the second selector member is released by the restraint means, the second selector member becomes The engine overrun prevention system for a vehicle manual transmission according to any one of claims 2 to 4, wherein the system is capable of returning to a predetermined position with respect to the first selector member. 6. The engine overrun prevention system for a manual transmission for a vehicle according to claim 2, wherein the selector shaft is rotatably held by a sleeve fixed to a vehicle body. 7. The vehicle manual transmission according to claim 2, wherein the first selector member is provided with a stopper that engages with the second selector member only in a predetermined rotation direction. Engine overrun prevention system.